> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/cg1018-relay-box-installation-manual/installation/config-file/practical_examples/standard_b2_or_rqs.md).

# B2/Coolguard

In this example we want to use the normal (single) URL used in both B2 and Coolguard (RQS), and we want it to behave like older versions of the Relay Box. That gives us the following scenario:

* CH1 shall control a sensor-alarm from server
* CH2 shall control a communication-alarm from server
* No Communication/Network failure signalling

## Operation mode

To achieve this the URL must be created in the server and the relevant alarm groups connected to it. 

Depending on the monitoring system type correct operation mode must be selected as described in [Operation modes](/cg1018-relay-box-installation-manual/installation/config-file/url__3_different_modes.md).

## Channels logic configuration

In the config file, only the URL has to be set to point to the server with the correct user ID.


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